Portable furnace



W. MAYOR.

PORTABLE FURNACE.

APPLICATION man nov.s. 1920. 1,408,624. Paten ed Mar- 7, 1922.

3 $HEETS-SHEET I.

W. MAYOR.

PORTABLE FURNACE.

APPLICATION HLED NOV. 3. 1920..

1,408,624. Patented Mar. 7,1922.

3 SHEETS SHEET 2.

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PORTABLE FURNACE. APPLICATION EILED N0v.3, 1920.

1,408,624. Patented Mar- 7, 1922.

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UNITED STATES Specification of Letters Patent.

JPORTABLE' FURNACE.

Patented Mar. 7, 1922.

Application filed November 3, 1920. Serial No. 421,444.

To allwhom it may concern:

,Be itknown that'I, WILLIAM MAYOR, a citizen of the United States, residing at East Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Portable Furnaces, of which the following is a full, clear, and exact description,ref erence being had to the accompanying drawings.

This invention relates to furnaces and is directed more particularly to portable furnaces such as are used in connection with drying ovens and similar structures. V

Some of the objects of the present invention, are to provide a furnace of the aforesaid character which shall be highly eiiiclent, simple in construction and inexpensive to build; to provide a furnace which shall have i a small grate area and yet be capable of replacing the source of heat using a large grate area usually found in connection with drying ovens and similar'structures;.to provide a furnace which may be conveniently and easily applied to existing types of ovens without involving expensive changes in construction;.to provide a furnace which shall be a self contained unit and be capable of many uses, while further objects and advantages will appear as the description proceeds.

In the accompanying drawings wherein I have shown an illustrative embodiment of my invention but without intent to limit myself thereto, Fig. 1 is a front elevation of a furnace constructed in accordance with my invention; Fig. 2 is a top plan view thereof; Fig. 3 is a side elevation illustrating my furnace connected to a drying oven Figs. 4: and

5 are sectional views taken on the lines 41-49: and 5-5 respectively of Fig. 2 Fig. 6 is a sectional view taken on the line .66 of Fig. 5; Fig. 7 is a sectional view-taken on the line 77 of Fig. 6 and Figs. 8 and 9 are vertical and horizontal sectional views of agdrying oven showing my furnace applied thereto.

. Heretofore drying ovens and similar structures have usually been heated by a.

grate built directly in such structures.

Grates of this character arenecessarily ofa 7 large area to assure even heat within the oven and consequently require a large amount of fuel. Furthermore, ovens heated in th1s manner circulate the heat to a very small extent and the steam, generated from the drying articles, condenses on the walls of the oven and hence requires additional heat to convert it again into steam before it is. finally driven from the enclosure.

With a furnace built in accordance with ,my invention, I use a small grate area and by means of a forced draft beneath and above the grate I promote complete combustion of the fuel and direct the current of hot air ;into the oven adjoiningthei furnace. The current of hot air passes over the articles, -qu1ckly drying them and carries the steam up the flue connected with the oven. I'am thus enabled to drythe articles in less time and withless fuel with a furnace of this nature,

A. furnace constructed and used in accordance with my inventionis shown in them:- companying drawings wherein 1 indicates the combustion chamber whichhas a series of'perforated grate bars 2 disposed adjacent the lower end thereof as shown in Figs. 47. The side walls 4 and 5, which are composed of fire brick, are'provided, each adjacentits outer. edge,with a pair of upwardly extending flues 6'-6 which are directed at their upper ends into the combustion chamher 1. The flues 6 are closed on their fourth side by a suitable metal casing 7 which encloses the side-walls 4 and 5 and the front wall 8 of said furnace. The lower ends of walls are also provided each with an opening 10 above, and an opening 11 below the grate which'may be closed in any suitable manner as-by means. of a sliding door 12. The openings 10--10 areifor the purpose of removingiclinkersan'd gaining access to the fuel above the grate while the openings 11.11 permit convenient removal of th ashes from beneath the grate.

fire brick, has formed therein a suitable fir- The front wall 8 which is composed of ing openingla ,whichis normally closed by a door 15 hinged as indicated at 16, said door being formed on the outer face with a series of grooves 17 to permit even expansion thereof. A forced draft is created by a fan 18 which may be driven in any suitable manner, as by an. electric motor 19, said draft being conducted to the under side of the grate by a pipe 20 and introduced into. the passage 9 at right angles thereto. Re lation of the draft is accomplished by a an} per 21 located in the pipe 20.

The rear side of the. furnace, indicated by th reference numeral 22, is provided with an outlet opening 23 to permit the hot air from said furnace to be directed into a drying oven or similar structure as shown in able handle 28. By the slotted hinge connection as shown in Fig. 3 I provide a simple and efficient means for relieving the expansion and contracting of the various arts and thus retain the door in tight relationship with respect to the opening 24 at all times.

In operation, the furnace is charged through the opening 1 1 and the draft regulated by the damper 21. The forced draft will blow up through the perforated grate and also up through the fines and over the top of the fire insuring complete combustion. Since the air draft is introduced at right angles to the passage 9, the grate will receive the proper draft before the excess air escapes up the fines 6. The heated air leaves the furnace through the opening 23 and is directed into the structure to be heated, which in the present instance, is shown as a drying oven (Figs. 8 and 9).

As indicated by the arrows. the hot air is' admitted to the oven through a series of openings 30 from whence it passes over the articles to be dried and then leaves through the discharge openings 31 451- regulat-ed by dampers 32 -32, to the flue indicated at 33.

*ith a furnace of this type I am enabled to inject continual current of hot air through the oven and thus dry the articles in a minimum of time. As shown in 1 and 3, I provide suitable openings 35-135 in:- the pipe 20 whichmay be opened when the furnace is shut down. and thus permit any back draft of heated air to escape before reaching the fan motor windings and caus ing any injury thereto. 7

Having thus described my inventionwhat liclaimisz 1.. :A; fumace of. the class described comprising a combustion chamber, a grate arranged within said chamber, a transverse passage extending beneath said grate and having an air duct connected thereto, flues connected with said passageway and opening into said combustion chamber above said grate, means for creating an air draft in said duct, and means for conducting the heated gases from said furnace.

-2. furnace of the class described comprising a combustion chamber, a grate arranged within said chamber, a transverse passage extending beneath said grate and having an air duct connected at right angles thereto, flues connected with the ends of said passageway and opening into said combustion chamber above said grate, a firing opening formed said furnace at right angles to said flues, means for creating an air draft in said duct, and means for conducting the heated gases from said furnace. V

.3. A furnace of the clam described comprising a combustion chamber open at the top thereof and having a perforated grate adjacent the lower end thereof, a door normally closing the top of said chamber, a transverse passage extending beneath the grate and side walls of said furnacep a plurality of flues connecting said passageway wit-h theupper portion of said combustion chamber, an'air drat't inlet connected with said passageway at right angles thereto and means for conducting the heated. gases from said furnace. V

'4. A furnace of the class described comprising a combustion chamber open at'the top thereof and havinga perforated grate adjacent the lowerendthereof, a door normally closing the top of said chamber, a transverse passage extending beneath the grate and side walls of said furnace,openi'ngs through said side walls connecting with said passage and with said combustion chamber above said grates. Hues connecting sa d passage with the upper portion of said combustion chamber, an air draft inlet connected, with said passage at rightangles thereto. and means for conduct-ing the heated gasesfrom said furnace. V 5. In a furnace of the class described, the combination with a combustion chamber open at the top thereof and, having a per forated grate adjacent the lowerend thereof. of a door normall closing the top of said chamber, means for retaining saiddoor in tight relationship; wit-h'respect to said opening at varying tenn aeratures and means for injecting an air draft above and below said state I p r '6. In a furnace ofthe class klcscribed, the combination, with. a combustion chamber, of a perforated gl ate positioned in. said chamb mi-Pa sag b ne h. sa gr te ha ing e s a e hfn hereof con ect ng wit said combustion 'chamber'above said grate,

and means for introducing an air draft into said passage at right angles thereto.

7. In a furnace of the class described, the combination with a combustion chamber, of a perforated grate positioned in said chamher, a passage beneath said grate, flues connecting the ends of said passage With the top of said icombustiozn chamber, an air duct inlet opening beneath said grate and an outlet opening adjacent the top of said combustion chamber, said openings being disposed at right angles to said passageway and said flues.

In testimony whereofi I hereunto aflix my signature.

WILLIAM MAYOR. 

